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        <h1 class="title">JavaScript和jQuery的一些方法</h1>
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            <span>七月 07, 2019</span>

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  <ul class="post-tags-list"><li class="post-tags-list-item"><a class="post-tags-list-link" href="/tags/学习/">学习</a></li></ul>



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            <h2 id="1、jQuery-each-（循环遍历）"><a href="#1、jQuery-each-（循环遍历）" class="headerlink" title="1、jQuery.each()（循环遍历）"></a><a href></a>1、jQuery.each()（循环遍历）</h2><p> jQuery.each() 函数用于遍历指定的对象和数组<br> 实例：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">//result为遍历对象，m为累加器，obj对应每个m所对应的result值</span><br><span class="line">jQuery.each(result, function(m,obj)&#123;</span><br><span class="line">		alert(obj);</span><br><span class="line">		&#125;)</span><br></pre></td></tr></table></figure>


<h2 id="2、setInterval-（定时器函数）"><a href="#2、setInterval-（定时器函数）" class="headerlink" title="2、setInterval(){}（定时器函数）"></a><a href></a>2、setInterval(){}（定时器函数）</h2><p> setInterval() 方法可按照指定的周期（以毫秒计）来调用函数或计算表达式。<br> setInterval() 方法会不停地调用函数，直到 clearInterval() 被调用或窗口被关闭。由 setInterval() 返回的 ID 值可用作 clearInterval() 方法的参数。</p>
<p> 实例：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">setInterval(function()&#123;</span><br><span class="line">			//执行方法</span><br><span class="line">						&#125;,1000);   //每秒调用一次</span><br></pre></td></tr></table></figure>


<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line">//常配合ajax使用</span><br><span class="line">setInterval(function()&#123;</span><br><span class="line">						$.ajax(&#123;</span><br><span class="line">							url:&apos;/Software-cup001/Current&apos;,</span><br><span class="line">							</span><br><span class="line">							//默认值: true，dataType 为 script 和 jsonp 时默认为 false。设置为 false 将不缓存此页面。</span><br><span class="line">							cache:false,</span><br><span class="line">							dataType:&quot;json&quot;,</span><br><span class="line">							data:&#123;&#125;,</span><br><span class="line">							//仅在服务器数据改变时获取新数据。默认值: false</span><br><span class="line">							ifModified:false,</span><br><span class="line">							success: function(result)&#123;</span><br><span class="line">								</span><br><span class="line">								//jQuery.each() 函数用于遍历指定的对象和数组</span><br><span class="line">//								jQuery.each(result, function(a,obj)&#123;</span><br><span class="line">//									var x = (new Date()).getTime();</span><br><span class="line">//									alert(result.length);</span><br><span class="line">									</span><br><span class="line">								if(r&gt;result.length)&#123;</span><br><span class="line">									t=result.length;</span><br><span class="line">									</span><br><span class="line">								&#125;</span><br><span class="line">								r=result.length;</span><br><span class="line">								for(;t&lt;result.length;t++)&#123;	</span><br><span class="line">//									alert(result[0].site);</span><br><span class="line">									if(result[t].site==&quot;校园大门&quot;)&#123;</span><br><span class="line">										</span><br><span class="line">										var x = (new Date()).getTime();</span><br><span class="line">										series.addPoint([x,result[t].headnum],true,true);</span><br><span class="line">										activeLastPointToolip(options);</span><br><span class="line">										&#125;													</span><br><span class="line">								&#125;</span><br><span class="line">//								&#125;);</span><br><span class="line">							&#125;</span><br><span class="line">						&#125;);	</span><br><span class="line">						&#125;,1000);</span><br></pre></td></tr></table></figure>


<h2 id="setTimeout-（定时器）"><a href="#setTimeout-（定时器）" class="headerlink" title="setTimeout()（定时器）"></a><a href></a>setTimeout()（定时器）</h2><p> setTimeout() 方法用于在指定的毫秒数后调用函数或计算表达式。<br> 实例：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">setTimeout(function()&#123; alert(&quot;Hello&quot;); &#125;, 3000);</span><br></pre></td></tr></table></figure>


<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">setTimeout(&quot;pie()&quot;,60000);</span><br></pre></td></tr></table></figure>



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